General Questions and Answers

A 950 mL gas sample begins at 1850 mm Hg and 65 C and ends with the volume of the gas at 2 5 L with a pressure of 1 5 atm What is the final temperature in degrees Celsius C 1 Using the named gas laws and Table 11 2 as your guide answer the following Based upon the volume change V1 to V2 how do you expect the temperature to change T1 to T2 The temperature should go Select the blank o Based upon the pressure change P1 to P2 how do you expect the temperature to change T1 to T2 The temperature should go the blank 2 Use the Combined Gas Law P1V1 T1 T2 P2V2 T2 Select When you rearrange the equation to solve for T2 what is the new equation There are 3 blanks in the numerator and 2 in the denominator Each blank should contain a letter number combination Select Select Select Select Choose up or down in Select Choose up or down in

Determine the enthalpy of reaction in kJ for HCI g NaNO s HNO 1 NaCl s Given the following thermochemical equations 2NaCl s H O l 2HCI g Na O s AH 507 1 kJ NO g NO g Na O s 2NaNO s AH 427 0 kJ NO g NO g N O g O g AH 43 01 kJ 2HNO 1 N O g O g H O 1 AH 34 02 kJ Answer to 1 decimal place

Compare the conjugate bases of these three acids Acid 1 hydrosulfuric acid H S Acid 2 nitrous acid HNO2 Acid 3 hydrogen sulfite HSO3 What is the formula for the strongest conjugate base

7 One step in the industrial refining of nickel is the decomposition of nickel carbonyl Ni CO 4 into nickel and carbon monoxide In a laboratory reaction 25 0 g nickel carbonyl yielded 5 34 g nickel a Balance the following equation for the reaction Ni CO g Ni s CO g b Determine the theoretical yield of nickel c Determine the percent yield

Compare the following Acid 1 hydrofluoric acid HF Acid 2 hydrogen sulfite ion HSO3 Acid 3 hypochlorous acid HCIO What is the formula for the weakest acid

Classify each reaction type 1 MN QP QN MP 2 CxHyOz Oz H2O CO2 3 JR R J 4 B D 5 K EP 1 2 3 4 5 BD E KP Choose Choose synthesis single replacement double replacement decomposition triple replacement combustion Choose J

How many moles of Al NO3 3 are produced when 39 14 grams of HNO3 are reacted with excess Al OH 3 Round your answer to three digits after the decimal point AI OH 3 3 HNO3 AI NO3 3 3 H O Your Answer

5 00 mL of a water sample was titrated for hardness with 4 15 mL of 0 0200 M EDTA How many moles of Ca were in the 5 00 mL of water 2 0 0830 moles 0 100 moles 1 00 x 10 4 moles 8 30 x 10 5 moles

Autoionization occurs when two solvent molecules collide and a proton is transferred between them Write the autoionization reaction for ammonia

1 Waves aquifers Write S salt water or F fresh water to classify ocean currents lake spring surface water tributary river glacier gully groundwater

Which of the following is essential to produce a spectrum Sunlight and prism Battery and torchlight O Torchlight and sunlight Prism and battery

The triple point state describes the set of conditions at which the phases of matter on Earth can exist in equilibrium Otwo O three four five

A researcher is using 1 53 x 1023 molecules of chlorine gas Cl in an experiment How many grams of chlorine is the researcher using Remember to include units abbreviated appropriately and the substance in your answer Round your answer to the nearest 0 01 Your Answer

Which of the following statements is correct Density of ice is always equal to density of water Density of ice is almost equal to density of water O Density of ice is greater than density of water Density of ice is lower than density of water

the element that has only one dark colored line in its absorption spectrum Magnesium Calcium Sodium Iron

For his Sociology class Felix did several field interviews to learn how people end up leaving the city for the suburbs He has analyzed the data and knows what he needs to cover in his presentation for class but he s having a hard time figuring out where to start and how the information should flow Why would an outline be helpful for Felix O An outline will help set the agenda for his presentation O Felix can use his outline to lay out the major themes and trust that the details will end up where they belong O Felix can use his outline to lay out the stages people experience as they find their way out of the city which will help him organize his paper and see patterns in the information O An outline will help him organize quotes from the interviews

n Chemistry there are specific rules for writing the formulas of compounds having a given name One or more of these formulas are breaking the rules Select all the rule breakers Tap to select or deselect an option Select all the rule breakers ammonium chloride NH CI iron II phosphate Fe PO4 3 lithium carbonate Li CO3 2

A substance has a freezing point of 10 C and a boiling point of 380 C At which of the following temperatures would the substance be in its liquid state O 140 C O 10 C O 390 C O 110 C

Ciker Free Vector Images from Pixabay https pixabay com vectors balloon birthday balloon 25734 It s 32 F 0 C outside under normal atmospheric conditions 1 atm at a stunt performer s birthday party There is a huge blue balloon filled with flammable hydro H molar mass 2 02 g mol gas that she plans to safely ignite causing a massiv explosion Inside the balloon is 243 g of H g What is the volume of the balloon in liters Round to the nearest whole number

2 What body part of the digestive system makes an enzyme for digestion

Flashlight batteries are called dry cells O True O False

21 Balance following reaction assuming a basic solution 5 points MnO4 aq CN aq MnO s CNO aq

The change in the states of matter is dependent on the quantity a added O volume O pressure O temperature energy

3 What carries food from the mouth to the stomach

What body part of the digestive system digests proteins fats and carbohydrates

4 What body part directs food to the stomach and prevents choking

5 Which body part in the digestive system makes bile changes food into energy clears alcohol some medicines and poisons from the blood

A 500 g piece of copper is heated from 25 Cto 85 C The missing values in the following table are Specific heat capacity of copper 0 385 J g C Ti C T C AT C O 11 55 25 85 and 6 85 25 23 and 60 60 11 55 85 and 25 25 85 60 and 11 55 mass 500 g q J

dentify the potential energy O The energy at rest The energy of motion The energy while moving The energy while rolling

Latent heat of vaporization of a substance if 100 J converts 6 g of the substance from liquid to gaseous state would be O 71 6 J g O 17 6J g 16 7 J g

The agent responsible for a body that is hot is Temperature O Mass Density Heat

In the laboratory a coffee cup calorimeter or constant pressure calorimeter is frequently used to determine the specific heat of a solid or to measure the energy of a solution phase reaction Since the cup itself can absorb energy a separate experiment is needed to determine the heat capacity of the calorimeter This is known as calibrating the calorimeter and the value determined is called the calorimeter constant One way to do this is to use a common metal of known heat capacity In the laboratory a student heats 90 72 grams of copper to 98 82 C and then drops it into a cup containing 77 51 grams of water at 22 98 C She measures the final temperature to be 30 32 C Using the accepted value for the specific heat of copper See the References tool calculate the calorimeter constant Calorimeter Constant 11 C

Balance the following equation 2 P2O5 TODRZ Answer number 4 P 5 What type of chemical reaction is this synthesis decomposition single replacement or double replacement decomposition with units 02 How many grams of Phosphorus will be produced if 14 5 Liters of Oxygen is also produced and element

For a certain chemical reaction DH is O and DS is 0 This means that we conclude the reaction may or may not be spontaneous but spontaneity is favored by high temperatures Owe cannot make any conchesion about spontaneity or even tendencies from the limited in formation presented O we conclude the reaction may or may not be spontaneous but spontaneity is favored by low temperatures we conclude the reaction must be spontaneous regardless of temperature and becomes even more so at lower temperatures we conclude the reaction must be non spontaneous regardless of temperature and becomes even more so at higher temperatures

Carbon and silicon dioxide react to form silicon carbide SiC molar mass 40 1 g mol and carbon monoxide Remember to balance your equation before beginning Silicon carbide is a semiconductor

Identify the correct statement with respect to colligative property Colligative property rarely depends on the amount of solute in the solution Colligative property depends on the amount of solute in the solution Colligative property does not depend on the amount of solute in the solution Colligative property sometime depends on the amount of solute in the solution

is the intermolecular forces exist in between ethanol molecules O Dipole induced dipole interaction Dipole dipole interaction Hydrogen bond London dispersion forces

Which of the following solutions has the greatest buffer capacity O 0 82 M HF and 0 91 M NaF O They are all buffer solutions and would all have the same capacity O 0 12 M HF and 0 67 M NaF O 0 82 M HF and 0 22 M NaF O 0 10 M HF and 0 22 M NaF

What is the name of the following compound CH CH C CH none of the above 1 butene C1 butyne 3 butene 2 butene

Which among the following is NOT a physical method to separate the components of a mixture Evaporation Filtration Distillation None of the choices

LIMITING REACTANT balance use dimensional analysis answer SHOW WORK 10 250 1 If 5 0 grams of S and 8 0 grams of O are used to produce SO which is the limiting reactant How much is produced 5 0164 064 132 066 S KMnO4 2 If 24 0 grams of S and 15 0 grams of O are used to produce SO which is the limiting reactant How much is produced 8 0 64 069 31 998 H SO4 K SO4 Mn 07 H O 3 If 500 grams of KMnO4 and 200 grams of H SO4 are used to produce K SO4 which is the limiting reactant How much is produced 4 If 400 grams of KMnO4 and 700 grams of H SO4 are used to produce Mn 0 which is the limiting reactant How much i

Name the following alkane CH3 CH CH3 2 3 dimethylpentane none of the above 2 isopropylbutane 3 isopropylbutane CH CH3 1 CH2 CH3

Ex4 a If 14 6 grams of copper II chloride react how many grams of sodium chloride NaCl can be formed CuCl2 NaNO3 Cu NO3 2 NaCl b How many grams of copper II nitrate are produced ym woH SYS 68 0 Ex5 What mass of oxygen is required for the complete reaction of 25 0 grams of glucose C6H12O6 C6H12O6 O2 CO2 H O om Yribm woh Salb to estom S mont b What mass of carbon dioxide is formed

Mass to Mass Conversions 3 step 1 Aluminum metal was heated causing it to react with oxygen in the air producing aluminum oxide 4 Al 3 0 2 Al O3 If 1 65 grams of aluminum are reacted how many grams of aluminum oxide are produced Answer 3 12 g 201 2 Considering the following balanced equation 6 ClO 3 H O 5 HClO3 HCl how many grams of H O are needed to produce 5 74 g HCI Answer 8 51 g

dentify the anti freezing agent O Sodium chloride Calcium chloride O Ethylene glycol All of the choices

Number of moles of NaCl present in 233 76 g of NaCl is

LIMITING REACTANT balance use dimens NaCl Cucb NaNO3 Cu NO3 2 5 If 15 0 grams of CuCl react with 20 grams of NaNO3 which is the limiting reactant How much is produced 6 If 30 grams of CuCl react with 27 grams of NaNO3 2 ans Dash which is the limiting reactant How much is produced Pb NO3 2 Nal NaNO3 Pblz 7 If 15 grams of Pb NO3 2 react with 15 grams of Nal which is the limiting reactant How much is produced 8 If 23 6 grams of Pb NO3 2 react with 25 1 grams of Nal Which is the limiting reactant How much is produced OnMX 002 N

Calculate the mass equivalent of the energy released by the complete combustion of 4 mol of methane 3560 kJ

he ves the amount and type of substances need nd the amount and type substances that are produced H O2H O moles of hydrogen react with produce moles of water bo 4 7101 moles of oxygen to Ex1 How many moles of oxygen are needed to react with 4 7 moles of hydrogen 2H 10 2H O 2 35 antong yon n wohl mal 02 Ex2 How many moles of water are produced from 0 53 moles of oxygen 11 02 H O Ex3 a How many moles of KCI can be produced from 4 2 moles of Cl2 K Cl KCI bixalb nodhoo to 280m ton b How many moles of K are needed

True or False A chloride ion contains 17 protons and 18 electrons True O False